Note 9 - Preferred Stock and Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 17, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Gain (Loss) on Revaluation of Warrants		$ (5,455)	$ 1,886	$ (5,822)	$ (4,418)
Common Stock Warrants [Member]
Gain (Loss) on Revaluation of Warrants		$ (5,500)	$ 1,900	$ (5,800)	(4,400)
Series A Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding (in shares)		87,978		87,978		82,948
Temporary Equity, Par or Stated Value Per Share (in dollars per share)						$ 0.0001
Preferred Stock, Convertible, Conversion Price (in dollars per share)		$ 5.00		$ 5.00
Series B Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding (in shares)		84,037		84,037		79,239
Temporary Equity, Par or Stated Value Per Share (in dollars per share)						$ 0.0001
Preferred Stock, Convertible, Conversion Price (in dollars per share)		$ 5.05		$ 5.05
Series C Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding (in shares)		62,959		62,959		59,366
Temporary Equity, Par or Stated Value Per Share (in dollars per share)						$ 0.0001
Preferred Stock, Convertible, Conversion Price (in dollars per share)		$ 2.73		$ 2.73
Convertible Preferred Stock [Member]
Temporary Equity, Dividend Rate Percentage				12.00%
Temporary Equity, Issued Price Per Share (in dollars per share)		$ 1,000		$ 1,000
Dividends, Preferred Stock, Paid-in-kind				$ 13,400	$ 11,500
Temporary Stock, Threshold Trading Days for Conversion (Day)				60 days
Temporary Stock, Threshold Consecutive Trading Days for Conversion (Day)				90 days
Temporary Stock, Conversion Price Minimum Percentage				175.00%
Temporary Stock, Maximum Business Days Following FID Event for Conversion (Day)				10 days
Convertible Preferred Stock [Member] | Subsequent Event [Member]
Dividends, Preferred Stock, Paid-in-kind	$ 7,000